High-temperature thermoelectric properties of (Zn1-xAlx)O

Michitaka Ohtaki, Toshiki Tsubota, Koichi Eguchi, Hiromichi Arai

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    477 Citations (Scopus)

    Abstract

    A mixed oxide (Zn1-xAlx)O exhibits promising thermoelectric properties attaining a dimensionless figure of merit ZT of 0.30 at 1000 °C, which value is much superior to other oxides and quite comparable to conventional state-of-the-art thermoelectric materials. The addition of a small amount of Al2O3 to ZnO results in a large power factor of 10-15×10-4 W/mK2, showing a marked increase in the electrical conductivity while retaining moderate thermoelectric power. A large product of the carrier mobility and density of states would be responsible for the favorable electrical properties of the present oxide. A figure of merit Z=0.24×10-3 K-1 is attained by (Zn0.98Al0.02)O at 1000 °C, even with a high thermal conductivity. A predominant proportion of the phonon thermal conductivity promises a further improvement in the thermoelectric performance by selective enhancement of phonon scattering.

    Original languageEnglish
    Pages (from-to)1816-1818
    Number of pages3
    JournalJournal of Applied Physics
    Volume79
    Issue number3
    DOIs
    Publication statusPublished - Feb 1 1996

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)

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